Pneumatic hammer



M ay 16, 19391 F. H. BORM PNEUMATIC HAMMER 4` Filed April 23, 193e f l z5 Viiv/vai?.

Patented May 16, 1939 UNITED STATES PATENT OFFICE Application April 23,

9 Claims.

This invention relates to pneumatic hammers and more especially to portable hammers suitable for automobile fender and body work.

One of the objects is to provide a simple, practical, and efficient device of the character speci- Another object is to provide an improved die holder for pneumatic hammers.

A further object is to provide an air hammer having a swivel die holder which will provide greater flexibility. Y

A further object is to provide a swivel die holder having a roller impact portion, by which the general operating characteristics of the device are greatly improved.

Other objects and advantages will appear and be brought out more fully in the following specilcation, reference being had to the accompanying drawing, wherein:

Fig. l is a side view of a pneumatic hammer embodying my invention;

Fig. 2 is an enlarged partial view of the same, illustrating my improved die holder;

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2; and

Fig. 4 is a View similar to Fig. 2, showing my invention in use on a somewhat modied supporting member.

Referring more particularly to the drawing, I

' show a frame member I0, preferably of tubular material such as steel, having suicient strength to substantially retain its shape, although, ii' desired, it may have a desired amount of resiliency, frame I9 having an upper extension II and a lower extension I2. A hammer head I3 having a hand portion I4 is secured to the upper extension II and is provided with a hammer cylinder I5. An eye-bracket I6 on hand piece I4 serves as a guide and support for an air hose I'I, and a valve I8 is interposed between hose I1 and hammer cylinder I5` A hammer plate I9 is adjustably secured in the lower portion of the hammer cylinder I5. Lower extension member I2 has secured to it a die holder 2l) having a hand por- 45 tion 2| and a spindle member 22, the latter being secured to the hand piece 2l by pivot 23. A pair of spring biased locking pins 24 is mounted in hand piece 2l, and a releasing plunger 25 is provided in they member 22 for releasing pins 24,

50 whereby the member 22 may be maintained at parallel or at right angles to hand piece 2 I. Member 22 has a seating shoulder 26, which in turn has a boss 21 and a spindle 28. A die seat member 29 having an inner chamber 39 and an aper- 55 ture 3l is adapted for mounting over the spindle 1936, Serial N0. 75,989

28 and is provided with a pair of diametrically opposite slots 32, which limit the movement of the seat 29 by the presence of a pin 33, which extends through shoulder 26, the ends of the pin being in the slots 32. A spring 34 seats on shoull der 26 and against the inner side of the die seat 29 and normally provides a seat for the die seat 29. A pin 35 extends radially or diametrically through spindle 28 substantially at or near the upper end thereof. A die member 36 is provided 10 with a longitudinal bore 31 and a diametrical or cross bore 38 receiving the ends of pin 35, and has a base portion 39 adapted to seat on die seat 29. An end recess 49 is provided in the upper end of die 36, and a pair of bearing recesses 4I is formed in the side walls of the upper end of die member 36 and provide bearings for a shaft 42, which carries an impact roller 43 which is preferably convex or barrel-shaped to facilitate movement along the irregular surfaces of the Work which is to be hammered. In Fig. 4 the spindle member 22 terminates in a xed shoulder 44 on which the base member 39 of the die is adapted to seat, the spring mounting being eliminated in this form.

In operation the die 36 is adapted for an appreciable amount of movement, both rotationally or circumferentially and vertically on the spindle member 28 inasmuch as the cross bore 38 is considerably larger than the diameter of the pin 35. This affords a considerable degree of flexibility in operation by reason of the loose, compensating or stop connection between the die and spindle support or spindle as described, at the same time insuring that the die member 36 will not become dislodged from the spindle. It will be apparent that the barrel roller 43 by virtue of its convex contour provides a smooth, rounded, and substantially frictionless surface over which the die member may be moved with ease in operation.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification Without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The combination with a pneumatic hammer having a U-frame and a hammer head thereon, of a die, a spindle support therefor upon said frame, said die having a cross bore and a cross member carried by the spindle support and extending into said cross bore, said cross bore being considerably larger than the cross member to 5 permit relative movement of the die on the spindle support axially and circumferentially.

2. The combination with a pneumatic hammer having a U-frame and a hammer head thereon, oi a die having a movable impact portion, a spindle member for supporting said die on said frame, a cross bore through the die traversing the spindle and a pin xed to the spindle and extending into the cross bore, said pin being considerably smaller than the cross bore to permit l5 considerable relative movement of the die on the spindle rotationally and axially.

3. The combination with a pneumatic hammer having a U-frame and a hammer head thereon, oi tubular die, a spindle support on the frame opposing the hammer head having a rigid upstanding reduced spindle, said die being mounted on the spindle, means between the die and spindie support urging the die toward the hammer 4d and limiting the movement thereof away om the hammer head, said means being limited its movement in the opposite direction toward the dic and hammer head, said die having a transverse aperture therethrough and a pin seri in said spindle and extending into said aperture, said aperture being considerably largerI in all directions than said pin.

fl. In a combination with a pneumatic hammer bfi-ving a U-irame and a hammer head thereon,

a spindle support on said frame opposite the 35`ha1nmer head, a die on the spindle support, a

die seat reciprocably mounted on the spindle support, means coacting between the spindle supand die seat to limit the downward moveoi the seat, a spring between the spindle support and seat urging the seat upward, said engaging said seat, and a loose connection between the upper end of the spindle and the die for limited movement of the die axially and circumferentially on the spindle and to prevent 45 totai displacement of the die from the spindle.

5. The combination with a pneumatic hammer "ng a U-irame and a hammer head thereon,

oindle support on said frame, a die on the die support, means between the spindle sup- -ind the base of the die to hold the die upand to cushion and limit the downward movement thereof as well as to limit the upward thrust oi the die, and a connection between the end of the spindle and the die to connect the same for an appreciable amount of movement rotationally and axially of the die on the spindle and to prevent displacement of the die from the spindle.

6. The combination with a pneumatic hammer having a U-frame and a hammer head on one portion thereof, of a che, a spindle support therefor on the other portion of the frame, means mounting said spindle support and die for movement in the plane of the frame to positions away from or into axial alignment with the hammer head, means to maintain the spindle member parallel or at right angles to the hammer head and connecting means between the spindle and die to connect the same for appreciable rotary and axial movement of the die on the spindle and limiting said movements.

7. A pneumatic hammer or the like, including a frame having upper and lower extensions, a hammer head having a hand portion secured to the upper extension, an air hose having a valve adjacent the hand portion, a hammer plate on the head, a hand piece on the lower extension, a spindle pivoted to the hand piece for movement to positions at right angles and parallel to the lower extension, and a die on the spindle having an impact portion and a compensating connection with the spindle to prevent disconnection thereof and limiting movement of the die on the spindle in two directions.

8. A pneumatic or like hammer, including a frame having upper and lower extensions, a hammer head having a hand portion secured to the upper extension, an air hose having a Valve adjacent the hand portions, a hammer plate on the head, a hand piece on the lower extension, a spindle pivoted to the hand piece for movement to positions at right angles and parallel to the lower extension, a die on the spindle having an impact portion, a coacting interconnection means between the die and spindle to allow the die limited turning and up and down movement on the spindle, and resilient means between the die and spindle to urge the die toward the hammer, said latter means being limited in its movements in opposite directions and held against turning.

9. A hammer of the class described comprising a frame, a die member, a spindle support member, one member having a transverse opening, a pin carried by the other member and extending into said opening, the opening being larger than the pin to allow relative movement of the die member on the support member axially and circumferentially.

FERDINAND H. BORM. 

